Surfboard fin



FIG. 1 is a perspective view of the surfboard fin.

FIG. 2 is a first side view thereof;

FIG. 3 is a second side view thereof;

FIG. 4 is rear side view thereof;

FIG. 5 is a front side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM The ornamental design for a surfboard fin, as shown. 